48 { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
49 { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
50 { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
51 { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
52 { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
53 { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
54 {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
55 { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
56 { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
57 { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
58 {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
59 { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
69 -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
70 -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
71 -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
72 -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
73 -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
74 -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
75 -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
76 -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
77 -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
78 -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
79 -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
80 -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
81 -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
82 -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
83 -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
84 -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
85 -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
86 -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
87 -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
88 -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
89 -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
90 -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
91 -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
92 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
93 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
94 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
95 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
96 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
97 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
98 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
99 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
100 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
119 204, 192, 179, 166, 153, 140, 128, 115,
120 102, 89, 76, 64, 51, 38, 25, 12,
121 0, -12, -25, -38, -51, -64, -76, -89,
122 -102, -115, -128, -140, -153, -166, -179, -192
129 { 74, 44, 25, 13, 7, 3},
130 { 68, 42, 24, 13, 7, 3},
131 { 58, 39, 23, 13, 7, 3},
132 {126, 70, 37, 19, 10, 5},
133 {132, 70, 37, 20, 10, 5},
134 {124, 70, 38, 20, 10, 5},
135 {120, 69, 37, 20, 11, 5},
136 {116, 67, 37, 20, 11, 5},
137 {108, 66, 36, 20, 10, 5},
138 {102, 62, 36, 20, 10, 5},
139 { 88, 58, 34, 19, 10, 5},
140 {162, 89, 49, 25, 13, 7},
141 {156, 87, 49, 26, 14, 7},
142 {150, 86, 47, 26, 14, 7},
143 {142, 84, 47, 26, 14, 7},
144 {131, 79, 46, 26, 14, 7}
283 int i, config_offset;
287 uint32_t als_id, header_size, trailer_size;
294 if (config_offset < 0)
334 if (als_id !=
MKBETAG(
'A',
'L',
'S',
'\0'))
347 int chan_pos_bits = av_ceil_log2(avctx->
channels);
348 int bits_needed = avctx->
channels * chan_pos_bits + 7;
355 for (i = 0; i < avctx->
channels; i++)
372 if (header_size == 0xFFFFFFFF)
374 if (trailer_size == 0xFFFFFFFF)
377 ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
384 if (ht_size > INT32_MAX)
397 ctx->
crc = 0xFFFFFFFF;
420 #define MISSING_ERR(cond, str, errval) \
423 avpriv_report_missing_feature(ctx->avctx, \
441 unsigned int div,
unsigned int **div_blocks,
442 unsigned int *num_blocks)
444 if (n < 31 && ((bs_info << n) & 0x40000000)) {
485 for (i = 0, j = k - 1; i < j; i++, j--) {
486 int tmp1 = ((
MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
487 cof[j] += ((
MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
491 cof[i] += ((
MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
506 unsigned int *ptr_div_blocks = div_blocks;
512 *bs_info <<= (32 - bs_info_len);
540 if (remaining <= div_blocks[b]) {
541 div_blocks[
b] = remaining;
546 remaining -= div_blocks[
b];
601 unsigned int sub_blocks, log2_sub_blocks, sb_length;
602 unsigned int start = 0;
603 unsigned int opt_order;
627 sub_blocks = 1 << log2_sub_blocks;
633 "Block length is not evenly divisible by the number of subblocks.\n");
641 for (k = 1; k < sub_blocks; k++)
644 for (k = 0; k < sub_blocks; k++) {
650 for (k = 1; k < sub_blocks; k++)
653 for (k = 1; k < sub_blocks; k++)
667 int opt_order_length = av_ceil_log2(av_clip((bd->
block_length >> 3) - 1,
695 for (k = 2; k < opt_order; k++)
702 k_max =
FFMIN(opt_order, 20);
703 for (k = 0; k < k_max; k++) {
706 quant_cof[k] =
decode_rice(gb, rice_param) + offset;
707 if (quant_cof[k] < -64 || quant_cof[k] > 63) {
709 "quant_cof %"PRIu32
" is out of range\n",
716 k_max =
FFMIN(opt_order, 127);
717 for (; k < k_max; k++)
721 for (; k < opt_order; k++)
730 for (k = 2; k < opt_order; k++)
731 quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13);
766 start =
FFMIN(opt_order, 3);
773 unsigned int b = av_clip((av_ceil_log2(bd->
block_length) - 3) >> 1, 0, 5);
784 for (sb = 0; sb < sub_blocks; sb++) {
785 unsigned int sb_len = sb_length - (sb ? 0 : start);
787 k [sb] = s[sb] > b ? s[sb] - b : 0;
788 delta[sb] = 5 - s[sb] + k[sb];
793 current_res += sb_len;
802 for (sb = 0; sb < sub_blocks; sb++, start = 0) {
803 unsigned int cur_tail_code =
tail_code[sx[sb]][delta[sb]];
804 unsigned int cur_k = k[sb];
805 unsigned int cur_s = s[sb];
807 for (; start < sb_length; start++) {
810 if (res == cur_tail_code) {
811 unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
817 res += (max_msb ) << cur_k;
819 res -= (max_msb - 1) << cur_k;
822 if (res > cur_tail_code)
836 *current_res++ = res;
842 for (sb = 0; sb < sub_blocks; sb++, start = 0)
843 for (; start < sb_length; start++)
860 unsigned int smp = 0;
875 for (ltp_smp =
FFMAX(*bd->
ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
876 int center = ltp_smp - *bd->
ltp_lag;
877 int begin =
FFMAX(0, center - 2);
878 int end = center + 3;
879 int tab = 5 - (end - begin);
884 for (base = begin; base < end; base++, tab++)
887 raw_samples[ltp_smp] += y >> 7;
893 for (smp = 0; smp < opt_order; smp++) {
896 for (sb = 0; sb < smp; sb++)
897 y +=
MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
899 *raw_samples++ -= y >> 20;
903 for (k = 0; k < opt_order; k++)
923 for (sb = -1; sb >= -sconf->
max_order; sb--)
924 raw_samples[sb] = right[sb] - left[sb];
929 for (sb = -1; sb >= -sconf->
max_order; sb--)
934 lpc_cof = lpc_cof + opt_order;
936 for (sb = 0; sb < opt_order; sb++)
937 lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
941 lpc_cof = lpc_cof_reversed + opt_order;
943 for (; raw_samples < raw_samples_end; raw_samples++) {
946 for (sb = -opt_order; sb < 0; sb++)
947 y +=
MUL64(lpc_cof[sb], raw_samples[sb]);
949 *raw_samples -= y >> 20;
957 sizeof(*raw_samples) * sconf->
max_order);
1025 const unsigned int *div_blocks,
int32_t *buf)
1027 unsigned int count = 0;
1029 for (; b < b_max; b++)
1030 count += div_blocks[b];
1033 memset(buf, 0,
sizeof(*buf) * count);
1040 unsigned int c,
const unsigned int *div_blocks,
1041 unsigned int *js_blocks)
1080 unsigned int c,
const unsigned int *div_blocks,
1081 unsigned int *js_blocks)
1084 unsigned int offset = 0;
1133 if (bd[0].js_blocks) {
1134 if (bd[1].js_blocks)
1137 for (s = 0; s < div_blocks[
b]; s++)
1138 bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
1139 }
else if (bd[1].js_blocks) {
1140 for (s = 0; s < div_blocks[
b]; s++)
1141 bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
1144 offset += div_blocks[
b];
1207 if (entries == channels) {
1221 unsigned int offset,
int c)
1224 unsigned int dep = 0;
1232 while (dep < channels && !ch[dep].stop_flag) {
1234 ch[dep].master_channel);
1239 if (dep == channels) {
1256 while (!ch[dep].stop_flag) {
1258 unsigned int begin = 1;
1263 if (ch[dep].time_diff_flag) {
1266 if (ch[dep].time_diff_sign) {
1273 for (smp = begin; smp < end; smp++) {
1275 MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
1276 MUL64(ch[dep].weighting[1], master[smp ]) +
1277 MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
1278 MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
1279 MUL64(ch[dep].weighting[4], master[smp + t]) +
1280 MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
1285 for (smp = begin; smp < end; smp++) {
1287 MUL64(ch[dep].weighting[0], master[smp - 1]) +
1288 MUL64(ch[dep].weighting[1], master[smp ]) +
1289 MUL64(ch[dep].weighting[2], master[smp + 1]);
1309 unsigned int div_blocks[32];
1311 unsigned int js_blocks[2];
1312 uint32_t bs_info = 0;
1327 for (c = 0; c < avctx->
channels; c++) {
1343 if (independent_bs) {
1345 div_blocks, js_blocks);
1350 ret =
decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks);
1366 unsigned int offset = 0;
1368 for (c = 0; c < avctx->
channels; c++)
1374 memset(reverted_channels, 0,
sizeof(*reverted_channels) * avctx->
channels);
1385 "Invalid block length %u in channel data!\n",
1390 for (c = 0; c < avctx->
channels; c++) {
1409 for (c = 0; c < avctx->
channels; c++) {
1411 reverted_channels, offset, c);
1415 for (c = 0; c < avctx->
channels; c++) {
1430 memset(reverted_channels, 0, avctx->
channels *
sizeof(*reverted_channels));
1431 offset += div_blocks[
b];
1436 for (c = 0; c < avctx->
channels; c++)
1457 int buffer_size = avpkt->
size;
1458 int invalid_frame, ret;
1459 unsigned int c,
sample, ra_frame, bytes_read, shift;
1470 if (sconf->
samples != 0xFFFFFFFF)
1479 "Reading frame data failed. Skipping RA unit.\n");
1491 #define INTERLEAVE_OUTPUT(bps) \
1493 int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \
1494 shift = bps - ctx->avctx->bits_per_raw_sample; \
1495 for (sample = 0; sample < ctx->cur_frame_length; sample++) \
1496 for (c = 0; c < avctx->channels; c++) \
1497 *dest++ = ctx->raw_samples[c][sample] << shift; \
1532 int16_t *src = (int16_t*) frame->
data[0];
1540 (uint32_t *) frame->
data[0],
1545 crc_source = frame->
data[0];
1565 bytes_read = invalid_frame ? buffer_size :
1612 unsigned int channel_size;
1613 int num_buffers, ret;
1676 for (c = 0; c < num_buffers; c++) {
1701 for (c = 0; c < num_buffers; c++)
1707 num_buffers * num_buffers);
1719 for (c = 0; c < num_buffers; c++)
1742 for (c = 1; c < avctx->
channels; c++)
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
static int als_weighting(GetBitContext *gb, int k, int off)
static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
Decode the block data for a non-constant block.
int msb_first
1 = original CRC calculated on big-endian system, 0 = little-endian
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
int * use_ltp
contains use_ltp flags for all channels
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
av_cold void ff_bgmc_end(uint8_t **cf_lut, int **cf_lut_status)
Release the lookup table arrays.
int32_t ** raw_samples
decoded raw samples for each channel
uint8_t * crc_buffer
buffer of byte order corrected samples used for CRC check
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
#define AV_LOG_WARNING
Something somehow does not look correct.
static const int16_t mcc_weightings[]
Inter-channel weighting factors for multi-channel correlation.
static void skip_bits_long(GetBitContext *s, int n)
int block_switching
number of block switching levels
int rlslms
use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
static int check_specific_config(ALSDecContext *ctx)
Check the ALSSpecificConfig for unsupported features.
int adapt_order
adaptive order: 1 = on, 0 = off
static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
Read the frame data.
int32_t * lpc_cof_reversed_buffer
temporary buffer to set up a reversed versio of lpc_cof_buffer
Block Gilbert-Moore decoder header.
#define FF_ARRAY_ELEMS(a)
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
unsigned int js_switch
if true, joint-stereo decoding is enforced
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
Read and decode block data successively.
#define INTERLEAVE_OUTPUT(bps)
static int32_t decode_rice(GetBitContext *gb, unsigned int k)
Read and decode a Rice codeword.
static int get_sbits_long(GetBitContext *s, int n)
Read 0-32 bits as a signed integer.
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
int * ltp_lag
contains ltp lag values for all channels
int * const_block
contains const_block flags for all channels
static const uint8_t ltp_gain_values[4][4]
Gain values of p(0) for long-term prediction.
static av_cold int decode_init(AVCodecContext *avctx)
Initialize the ALS decoder.
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
int32_t * lpc_cof
coefficients of the direct form prediction
enum AVSampleFormat sample_fmt
audio sample format
static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
Decode the block data for a constant block.
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
int ** ltp_gain
gain values for ltp 5-tap filter for a channel
static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
Read the block data for a constant block.
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
int chan_sort
channel rearrangement: 1 = on, 0 = off
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
int joint_stereo
joint stereo: 1 = on, 0 = off
static int get_bits_count(const GetBitContext *s)
bitstream reader API header.
static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame, unsigned int c, const unsigned int *div_blocks, unsigned int *js_blocks)
Decode blocks independently.
void ff_bgmc_decode_init(GetBitContext *gb, unsigned int *h, unsigned int *l, unsigned int *v)
Initialize decoding and reads the first value.
unsigned int block_length
number of samples within the block
static void zero_remaining(unsigned int b, unsigned int b_max, const unsigned int *div_blocks, int32_t *buf)
Compute the number of samples left to decode for the current frame and sets these samples to zero...
int ra_distance
distance between RA frames (in frames, 0...255)
int32_t * quant_cof_buffer
contains all quantized parcor coefficients
ALSChannelData * chan_data_buffer
contains channel data for all channels
int bgmc
"Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
static int get_bits_left(GetBitContext *gb)
int * use_ltp
if true, long-term prediction is used
enum RA_Flag ra_flag
indicates where the size of ra units is stored
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
int ltp_lag_length
number of bits used for ltp lag value
static av_cold void dprint_specific_config(ALSDecContext *ctx)
unsigned int * opt_order
prediction order of this block
int * chan_pos
original channel positions
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
static const int16_t parcor_scaled_values[]
Scaled PARCOR values used for the first two PARCOR coefficients.
int32_t ** lpc_cof
coefficients of the direct form prediction filter for a channel
int chan_config_info
mapping of channels to loudspeaker locations. Unused until setting channel configuration is implement...
unsigned int num_blocks
number of blocks used in the current frame
void av_log(void *avcl, int level, const char *fmt,...)
const char * name
Name of the codec implementation.
int32_t * prev_raw_samples
contains unshifted raw samples from the previous block
static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame, unsigned int c, const unsigned int *div_blocks, unsigned int *js_blocks)
Decode blocks dependently.
void ff_bgmc_decode_end(GetBitContext *gb)
Finish decoding.
int * bgmc_lut_status
pointer at lookup table status flags used for BGMC
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
int * store_prev_samples
if true, carryover samples have to be stored
unsigned int * shift_lsbs
contains shift_lsbs flags for all channels
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
Read the block data for a non-constant block.
int chan_config
indicates that a chan_config_info field is present
void ff_bgmc_decode(GetBitContext *gb, unsigned int num, int32_t *dst, int delta, unsigned int sx, unsigned int *h, unsigned int *l, unsigned int *v, uint8_t *cf_lut, int *cf_lut_status)
Read and decode a block Gilbert-Moore coded symbol.
static av_cold int decode_end(AVCodecContext *avctx)
Uninitialize the ALS decoder.
int * const_block
if true, this is a constant value block
int floating
1 = IEEE 32-bit floating-point, 0 = integer
uint32_t crc
CRC value calculated from decoded data.
int coef_table
table index of Rice code parameters
int sb_part
sub-block partition
int32_t * raw_other
decoded raw samples of the other channel of a channel pair
if(ac->has_optimized_func)
uint8_t * bgmc_lut
pointer at lookup tables used for BGMC
#define AVERROR_PATCHWELCOME
Not yet implemented in Libav, patches welcome.
int * ltp_gain
gain values for ltp 5-tap filter
int js_blocks
true if this block contains a difference signal
unsigned int ra_block
if true, this is a random access block
Libavcodec external API header.
static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
Convert PARCOR coefficient k to direct filter coefficient.
int sample_rate
samples per second
main external API structure.
static void close(AVCodecParserContext *s)
ALSChannelData ** chan_data
channel data for multi-channel correlation
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Decode an ALS frame.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
#define MISSING_ERR(cond, str, errval)
static unsigned int get_bits1(GetBitContext *s)
static void skip_bits1(GetBitContext *s)
unsigned int s_max
maximum Rice parameter allowed in entropy coding
static void skip_bits(GetBitContext *s, int n)
int * ltp_lag
lag value for long-term prediction
int32_t * lpc_cof_buffer
contains all coefficients of the direct form prediction filter
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data...
static const int8_t parcor_rice_table[3][20][2]
Rice parameters and corresponding index offsets for decoding the indices of scaled PARCOR values...
static av_cold int read_specific_config(ALSDecContext *ctx)
Read an ALSSpecificConfig from a buffer into the output struct.
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
int long_term_prediction
long term prediction (LTP): 1 = on, 0 = off
int32_t * raw_samples
decoded raw samples / residuals for this block
int * reverted_channels
stores a flag for each reverted channel
unsigned int * opt_order
contains opt_order flags for all channels
int32_t * raw_buffer
contains all decoded raw samples including carryover samples
int max_order
maximum prediction order (0..1023)
uint32_t samples
number of samples, 0xFFFFFFFF if unknown
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
#define CODEC_CAP_SUBFRAMES
Codec can output multiple frames per AVPacket Normally demuxers return one frame at a time...
int mc_coding
extended inter-channel coding (multi channel coding): 1 = on, 0 = off
static const uint8_t tail_code[16][6]
Tail codes used in arithmetic coding using block Gilbert-Moore codes.
common internal api header.
int32_t * prev_raw_samples
contains unshifted raw samples from the previous block
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
static av_cold void flush(AVCodecContext *avctx)
Flush (reset) the frame ID after seeking.
int * ltp_gain_buffer
contains all gain values for ltp 5-tap filter
int32_t * quant_cof
quantized parcor coefficients
static av_cold int init(AVCodecParserContext *s)
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int bit_size, int sync_extension)
Parse MPEG-4 systems extradata to retrieve audio configuration.
#define MKBETAG(a, b, c, d)
static void parse_bs_info(const uint32_t bs_info, unsigned int n, unsigned int div, unsigned int **div_blocks, unsigned int *num_blocks)
Parse the bs_info field to extract the block partitioning used in block switching mode...
int32_t ** quant_cof
quantized parcor coefficients for a channel
int channels
number of audio channels
int crc_enabled
enable Cyclic Redundancy Checksum
uint32_t crc_org
CRC value of the original input data.
static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
Decode the block data.
static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
Read the block data.
int frame_length
frame length for each frame (last frame may differ)
static const uint8_t * align_get_bits(GetBitContext *s)
static const struct twinvq_data tab
unsigned int * shift_lsbs
shift of values for this block
av_cold int ff_bgmc_init(AVCodecContext *avctx, uint8_t **cf_lut, int **cf_lut_status)
Initialize the lookup table arrays.
static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
Read the channel data.
static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks, uint32_t *bs_info)
Read block switching field if necessary and set actual block sizes.
int * store_prev_samples
contains store_prev_samples flags for all channels
unsigned int frame_id
the frame ID / number of the current frame
static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd, ALSChannelData **cd, int *reverted, unsigned int offset, int c)
Recursively reverts the inter-channel correlation for a block.
This structure stores compressed data.
int nb_samples
number of audio samples (per channel) described by this frame
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
unsigned int cur_frame_length
length of the current frame to decode
int resolution
000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit